In this video, I show you how to fix a dead HP Probook 4540s motherboard using schematics diagrams, We trace onboard IC from the schematics measuring with a digital multimeter to find out the root cause.
This motherboard couldn't allow 19V to go through the first MOSFET because of a missing ADP_EN (Adapter enable) signal, we traced back and discovered a burnt diode that disconnected power from the standby chip which creates power for EC to release adapter enable signal.

Check out my first videos about laptop schematics repair to easily understand this video.

Download a pdf document that explains the meaning of different Schematics codes and abbreviations from the link below. https://drive.google.com/file/d/1bc6q...